Display screen or portion thereof having a graphical user interface



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FIG. 1 is a front view of a first embodiment of a display screen or portion thereof having a graphical user interface; and,

FIG. 2 is a front view of a second embodiment of a display screen or portion thereof having a graphical user interface.

The dot-dashed broken lines depict the display screen or portion thereof and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof having a graphical user interface, as shown and described. 